LG HB620 - Main LCD Trouble

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Only for training and service purposes
4. TROUBLE SHOOTING
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4.9 Main LCD trouble
Main LCD control signals are generated by MSM6280. Those signal’s path are :
MSM6280 → TCC7920 → 64-pin connector(CN502 in Main PCB) → 40-pin connector (in LCD
Module)
Check the main board
TCC_2.7V_EHI_LCD(R830)
FILTER_LCD_SESET_N(#6 FL501)
FILTER_MM_LCD_DATA[0]~[15]
(FL502~F
L505)
ENDLCD display OK?
Is the circuit power on?
Follow the power on
trouble shootin
g
YES
END
Start
Disconnect and reconnect
70-pin B to B connector
Change the main board
Press END key to turn the power on.
Change the LCD FPCB
Camera is OK?
Press END key to turn the power on.
YES
YES
NO
NO
YES
Check the LCD FPCB
TCC_2.7V_EHI_LCD(D402)
FILTER_LCD_SESET_N(#16 CN103)
FILTER_MM_LCD_DATA[0]~[15]
(#7~#14, #34~#27, CN103)
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